Malicious extension, report it for abuse. Don't let them fool you, even though you can change the home page in options, the extension will restart the rspark.com home page everytime you close-restart firefox.
Well, it functions fine. It installs adware though. Your home screen will become rspark.com and apparently you won't be able to simply change it in settings. Apparently, you have to completely reset Firefox's settings to get rid of it.
The best thing to do with this add-on is report it for abuse.
Spaces in adresses support, simple and VERY USEFUL IF U DON'T WANNA LOOSE TIME!! and for the start tab like the other comment... Just desactivate it in the plug-in menu when you don't need that thing, it takes maybe 4 seconds to you ^_^ !